In the OSPF routing domain, in broadcast networks and NBMA networks containing at least two routers, one router must be designated as the DR and the other as the BDR.

Which of the following is a VPN technology that neither supports user identity authentication nor data encryption and verification?

Which of the following tools cannot be directly referenced by the apply clause of a route-policy?

The command format of the prefix list (IP-Prefx) is ip ip-prefx ip-prefix-name [index index-number] permit | deny] ipv4-address mask-length [ greater-equal greater- equal-value] [less -equal less-equal- value], if only greater-equal is specified and less-equal is not specified, the prefix range is:

RSTP has been improved on the basis of STP, realizing fast convergence of network topology. However, both RSTP and STP are based on a single spanning tree, and there are some shortcomings, such as? (Multiple choice)